(1) Determine the direction: determine the suitable route of cable tray according to the building layout plan, combined with the setting of air conditioning pipeline and electrical pipeline, convenient maintenance, and the density of cable route. In the room, it should be erected along the walls, columns, beams and floors of the building as much as possible. If it is possible to use the integrated pipe gallery for erection, it should be erected parallel on one side or above the pipe and consider that the downline and branch line should avoid crossing as much as possible. If there is no other pipe rack to borrow, it is necessary to set up (support) columns by itself.

(2)荷載計算:計算電纜橋架主干線縱斷面上單位長度的電纜重量。

(2) Load calculation: calculate the weight of cable per unit length on the profile of cable bridge trunk line.

(3)確定橋架的寬度:根據布放電纜條數、電纜直徑電纜的間距來確定電纜橋架的型號、規格，托臂的長度,支柱的長度、間距橋架的寬度和層數

(3) Determine the width of the cable tray: determine the model and specification of the cable tray, the length of the bracket, the length of the support, the width and the number of layers of the cable tray according to the number of cables laid and the cable diameter and the spacing of the cable

(4)確定安裝方式:根據場所的設置條件確定橋架的固定方式選擇懸吊式、直立式、側壁式或是混合式,連接件和緊固件一般是配套供應的,此外根據橋架結構選折相應的蓋板。

(4) Determine the installation mode: determine the fixed mode of the bridge according to the setting conditions of the site. Select the suspension type, vertical type, side wall type or hybrid type. The connectors and fasteners are generally supplied in a complete set. In addition, select the corresponding cover plate according to the bridge structure.

(5)繪出電纜橋架平、剖面圖,局部部位還應繪出空間圖,開列材料表。

(5) Draw the plane and section drawings of the cable tray, and the space map and material list for local parts.

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